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Before contest
Codeforces Round 941 (Div. 1)
30:07:45
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Before contest
Codeforces Round 941 (Div. 2)
30:07:45
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data structures
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
4C
Registration System
data structures
,
hashing
,
implementation
1300
x76724
1703B
ICPC Balloons
data structures
,
implementation
800
x45048
1520D
Same Differences
data structures
,
hashing
,
math
1200
x42381
368B
Sereja and Suffixes
data structures
,
dp
1100
x39383
519B
A and B and Compilation Errors
data structures
,
implementation
,
sortings
1100
x37605
1760C
Advantage
data structures
,
implementation
,
sortings
800
x34812
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x34475
1722C
Word Game
data structures
,
implementation
800
x29288
1714B
Remove Prefix
data structures
,
greedy
,
implementation
800
x29234
1807D
Odd Queries
data structures
,
implementation
900
x28455
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x27284
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x26880
1324C
Frog Jumps
binary search
,
data structures
,
dfs and similar
,
greedy
,
implementation
1100
x26829
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x26730
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x26617
1213B
Bad Prices
data structures
,
implementation
1100
x25575
1690C
Restoring the Duration of Tasks
data structures
,
greedy
,
implementation
800
x25349
1348B
Phoenix and Beauty
constructive algorithms
,
data structures
,
greedy
,
sortings
1400
x24499
1703D
Double Strings
brute force
,
data structures
,
strings
1100
x24213
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x24054
276C
Little Girl and Maximum Sum
data structures
,
greedy
,
implementation
,
sortings
1500
x23903
1497A
Meximization
brute force
,
data structures
,
greedy
,
sortings
800
x23834
339D
Xenia and Bit Operations
data structures
,
trees
1700
x23542
1430C
Numbers on Whiteboard
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1000
x23273
1380A
Three Indices
brute force
,
data structures
900
x23135
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x23024
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x22888
1730A
Planets
data structures
,
greedy
,
sortings
800
x22484
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22281
1365C
Rotation Matching
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x22190
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x22173
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x22054
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x21932
1709B
Also Try Minecraft
data structures
,
dp
,
implementation
900
x21794
1512D
Corrupted Array
constructive algorithms
,
data structures
,
greedy
1200
x21640
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21588
1702C
Train and Queries
data structures
,
greedy
1100
x21436
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x21230
1526C1
Potions (Easy Version)
brute force
,
data structures
,
dp
,
greedy
1500
x21116
1526C2
Potions (Hard Version)
data structures
,
greedy
1600
x20902
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x20730
1506D
Epic Transformation
constructive algorithms
,
data structures
,
greedy
1400
x20656
1622B
Berland Music
data structures
,
greedy
,
math
,
sortings
1000
x20506
1375C
Element Extermination
constructive algorithms
,
data structures
,
greedy
1400
x20402
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20368
1165B
Polycarp Training
data structures
,
greedy
,
sortings
1000
x20261
1006C
Three Parts of the Array
binary search
,
data structures
,
two pointers
1200
x20137
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x20130
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x19993
1200A
Hotelier
brute force
,
data structures
,
implementation
800
x19906
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19836
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x19824
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x19609
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x19553
1767B
Block Towers
data structures
,
greedy
,
sortings
800
x19551
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19206
767A
Snacktower
data structures
,
implementation
1100
x19179
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x19109
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x19109
1438B
Valerii Against Everyone
constructive algorithms
,
data structures
,
greedy
,
sortings
1000
x18359
1490E
Accidental Victory
binary search
,
data structures
,
greedy
1400
x18321
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x18223
1492B
Card Deck
data structures
,
greedy
,
math
1100
x18082
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x18061
1703F
Yet Another Problem About Pairs Satisfying an Inequality
binary search
,
data structures
,
dp
,
greedy
,
sortings
1300
x18048
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18043
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18018
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x17869
1698C
3SUM Closure
brute force
,
data structures
1300
x17848
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17774
1399D
Binary String To Subsequences
constructive algorithms
,
data structures
,
greedy
,
implementation
1500
x17630
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x17610
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x17586
1353D
Constructing the Array
constructive algorithms
,
data structures
,
sortings
1600
x17308
1689B
Mystic Permutation
data structures
,
greedy
900
x17078
1679B
Stone Age Problem
data structures
,
implementation
1200
x16880
1669E
2-Letter Strings
data structures
,
math
,
strings
1200
x16805
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x16672
1515C
Phoenix and Towers
constructive algorithms
,
data structures
,
greedy
1400
x16443
1234B2
Social Network (hard version)
data structures
,
implementation
1300
x16438
816B
Karen and Coffee
binary search
,
data structures
,
implementation
1400
x16350
1393B
Applejack and Storages
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x16231
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x16028
1730C
Minimum Notation
data structures
,
greedy
,
math
,
sortings
1200
x16019
295A
Greg and Array
data structures
,
implementation
1400
x15985
1519C
Berland Regional
brute force
,
data structures
,
greedy
,
number theory
,
sortings
1400
x15915
1349A
Orac and LCM
data structures
,
math
,
number theory
1600
x15851
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15843
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x15828
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15740
501B
Misha and Changing Handles
data structures
,
dsu
,
strings
1100
x15555
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x15536
1426D
Non-zero Segments
constructive algorithms
,
data structures
,
greedy
,
sortings
1500
x15454
1490F
Equalize the Array
binary search
,
data structures
,
greedy
,
math
,
sortings
1500
x15403
1320A
Journey Planning
data structures
,
dp
,
greedy
,
math
,
sortings
1400
x15397
1728C
Digital Logarithm
data structures
,
greedy
,
sortings
1400
x15031
650A
Watchmen
data structures
,
geometry
,
math
1400
x15025
1551B2
Wonderful Coloring - 2
binary search
,
constructive algorithms
,
data structures
,
greedy
1400
x15017
637B
Chat Order
*special problem
,
binary search
,
constructive algorithms
,
data structures
,
sortings
1200
x14982
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x14631
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